CN201956725U - Equalizing device of power iron phosphate lithium battery pack - Google Patents
Equalizing device of power iron phosphate lithium battery pack Download PDFInfo
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- CN201956725U CN201956725U CN2011200735194U CN201120073519U CN201956725U CN 201956725 U CN201956725 U CN 201956725U CN 2011200735194 U CN2011200735194 U CN 2011200735194U CN 201120073519 U CN201120073519 U CN 201120073519U CN 201956725 U CN201956725 U CN 201956725U
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- mcu
- measurement module
- voltage
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Abstract
The utility model relates to an equalizing device of a power iron phosphate lithium battery pack. The equalizing device comprises a MCU (Micro-Control Unit), an electro-discharge equalizing module, a communication module, a voltage measurement module, a current measurement module and a temperature measurement module, wherein the voltage measurement module measures a voltage signal in each single battery of the battery pack and transmits the signal to the MCU; the current measure module measures a current signal of the battery pack and transmits the signal to the MCU; the temperature measurement module measures a temperature signal of the battery pack and transmits the signal to the MCU; and the MCU is connected with the battery pack by the electro-discharge equalizing module. The voltage measurement module measures the voltage of each single battery of the battery pack, so as to determine whether the equalization is needed, so that the battery equalization can be realized in a more accurate and scientific way, and the energy consumption can be reduced during the equalization.
Description
Technical field
The utility model relates to the battery set management technology, especially the balancer of power ferric phosphate lithium cell group.
Background technology
The meaning of lithium ion battery group equilibrium is utilized electronic technology exactly, and the lithium-ion battery monomer voltage deviation is remained in the scope of expection, thereby guarantees that every joint cell is not damaged when normal the use.If do not carry out equilibrium control, along with the increase of charge and discharge cycles, each monomer battery voltage breaks up gradually, and will reduce greatly useful life.
To the equilibrium of dynamic lithium battery group, general terminal voltage with lithium-ion battery monomer is consistent to be target, adopts the equalization discharge means, promptly the higher battery of terminal voltage is discharged, and reduces its magnitude of voltage at present.And battery terminal voltage directly is subjected to the influence of battery operated state and change, and the factor that obviously influences terminal voltage has the polarizing voltage of battery and the ohm voltage drop of the internal resistance of cell.Thus, be that standard is carried out equalization discharge with the actual terminal voltage Voc of battery, bring unnecessary energy loss can for discharging and recharging of battery pack.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of balancer of power ferric phosphate lithium cell group, can be more accurate, science carry out battery balancedly, reduce the energy that consumes in the equilibrium.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of balancer of power ferric phosphate lithium cell group comprises MCU, equalization discharge module, communication module, voltage measurement module, current measurement module and temperature-measuring module; Described voltage measurement module is measured the voltage signal of every joint cell in the battery pack and is transferred signals to MCU, described current measurement module is measured the current signal of battery pack and is transferred signals to MCU, described temperature-measuring module is measured the temperature signal of battery pack and is transferred signals to MCU, and described MCU is connected with battery pack by the equalization discharge module.Before battery was carried out equilibrium, MCU obtained the magnitude of voltage and the temperature value of each cell of battery pack by voltage measurement module and temperature-measuring module; According to the temperature of each cell, it is balanced to judge whether battery pack is fit to; By relatively drawing battery pack ceiling voltage Vmax and minimum voltage Vmin, greater than 3.05V and Vmax-Vmin＞15mV, then battery pack can enter equalization program to MCU as if Vmax again.
As improvement, described battery pack is in series by the more piece ferric phosphate lithium cell.
As improvement, described voltage measurement module is a LTC6802 voltage measurement chip.
As improvement, described current measurement module mainly is made up of shunt and voltameter.
As improvement, be provided with CAN communication interface and RS-485 communication interface in the described communication module.
The beneficial effect that the utility model is compared with prior art brought is:
Voltage measurement module is by to the detection of every joint monomer battery voltage in the battery pack, and then judges whether to carry out equilibrium, can be more accurate, science carry out battery balancedly, reduce the energy that consumes in the equilibrium.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is a workflow diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with Figure of description.
As shown in Figure 1, a kind of balancer of power ferric phosphate lithium cell group comprises MCU 2, equalization discharge module 6, communication module 7, voltage measurement module 3, current measurement module 4 and temperature-measuring module 5; Described voltage measurement module 3 is measured the voltage signal of every joint cell in the battery pack and is transferred signals to MCU 2, described current measurement module 4 is measured the current signal of battery pack and is transferred signals to MCU 2, described temperature-measuring module 5 is measured the temperature signal of battery pack and is transferred signals to MCU 2, and described MCU 2 is connected with battery pack by equalization discharge module 6.
Ferric phosphate lithium cell group 1 is in series by 12 joint lithium batteries; Voltage measurement module 3 uses LTC6802 voltage measurement chip, measures each cell terminal voltage of battery pack in real time; Current measurement module 4 is made up of shunt and voltameter, measures the battery pack operating current in real time; Temperature-measuring module 5 is 12 digital temperature sensor DS18B20 that connect with monobus, measures the temperature of each cell of battery pack in real time; Equalization discharge module 6 is carried out the discharge process of 0.1A by MCU control to the cell that needs is arranged; Communication module 7 comprises CAN communication interface and RS-485 communication interface, and this device carries out exchanges data by secondary module and other equipment.
Operation principle of the present utility model is as follows:
As shown in Figure 2, at first according to the state of battery pack, judge whether to carry out equilibrium.Voltage measurement module 3, current measurement module 4 and temperature-measuring module 5 are all at real-time terminal voltage, electric current and the temperature value of measuring ferric phosphate lithium cell group 1; MCU 2 reads the magnitude of voltage and the temperature value of each cell of battery pack successively, judges whether this temperature is fit to battery pack balancing, is then to continue; By comparing battery pack least significant end voltage Vmin and most significant end voltage Vmax, if Vmax＞3.05 and Vmax-Vmin＞15mv, think that then this battery pack can carry out equilibrium by MCU2.
In case battery pack need be carried out equilibrium, MCU 2 just reads the operating current I of current measurement module 4, multiply each other with known internal resistance of single cell r, ohm voltage drop v
r=r * 1; Again according to cell terminal voltage V
0Estimating battery polarizing voltage v
pBy formula v
Oc=v
o-v
p-v
rGet the actual open circuit voltage V of each cell of battery pack
OcFind out actual minimum open circuit voltage Vocmin, open circuit voltage is higher than cell more than this magnitude of voltage 15mV, carry out discharge process with the constant current of 0.1A.
Continuous circulation said process, reaching balanced standard until battery open circuit voltage is that extreme difference is less than 15mV.
Claims (5)
1. the balancer of a power ferric phosphate lithium cell group is characterized in that: comprise MCU, equalization discharge module, communication module, voltage measurement module, current measurement module and temperature-measuring module; Described voltage measurement module is measured the voltage signal of every joint cell in the battery pack and is transferred signals to MCU, described current measurement module is measured the current signal of battery pack and is transferred signals to MCU, described temperature-measuring module is measured the temperature signal of battery pack and is transferred signals to MCU, and described MCU is connected with battery pack by the equalization discharge module.
2. the balancer of a kind of power ferric phosphate lithium cell group according to claim 1 is characterized in that: described battery pack is in series by the more piece ferric phosphate lithium cell.
3. the balancer of a kind of power ferric phosphate lithium cell group according to claim 1 is characterized in that: described voltage measurement module is a LTC6802 voltage measurement chip.
4. the balancer of a kind of power ferric phosphate lithium cell group according to claim 1 is characterized in that: described current measurement module mainly is made up of shunt and voltameter.
5. the balancer of a kind of power ferric phosphate lithium cell group according to claim 1 is characterized in that: be provided with CAN communication interface and RS-485 communication interface in the described communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200735194U CN201956725U (en) | 2011-03-18 | 2011-03-18 | Equalizing device of power iron phosphate lithium battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200735194U CN201956725U (en) | 2011-03-18 | 2011-03-18 | Equalizing device of power iron phosphate lithium battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201956725U true CN201956725U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200735194U Expired - Fee Related CN201956725U (en) | 2011-03-18 | 2011-03-18 | Equalizing device of power iron phosphate lithium battery pack |
Country Status (1)
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| CN (1) | CN201956725U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856886A (en) * | 2012-08-31 | 2013-01-02 | 华南理工大学 | Electromobile battery protecting circuit |
| CN104779665A (en) * | 2015-03-12 | 2015-07-15 | 浙江大学 | Mobile power supply capable of equalizing charge |
| CN105826989A (en) * | 2016-06-01 | 2016-08-03 | 深圳市德兰明海科技有限公司 | Intelligently controlled and balanced battery management system |
| WO2017139967A1 (en) * | 2016-02-19 | 2017-08-24 | 宁德时代新能源科技股份有限公司 | Battery pack balancing method, battery management system and battery system |
| CN107797011A (en) * | 2017-12-06 | 2018-03-13 | 深圳市科陆电子科技股份有限公司 | Energy storage BMS balance policy analog detection method and device |
-
2011
- 2011-03-18 CN CN2011200735194U patent/CN201956725U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856886A (en) * | 2012-08-31 | 2013-01-02 | 华南理工大学 | Electromobile battery protecting circuit |
| CN104779665A (en) * | 2015-03-12 | 2015-07-15 | 浙江大学 | Mobile power supply capable of equalizing charge |
| CN104779665B (en) * | 2015-03-12 | 2017-06-30 | 浙江大学 | It is a kind of can equalizaing charge portable power source |
| WO2017139967A1 (en) * | 2016-02-19 | 2017-08-24 | 宁德时代新能源科技股份有限公司 | Battery pack balancing method, battery management system and battery system |
| CN108780927A (en) * | 2016-02-19 | 2018-11-09 | 宁德时代新能源科技股份有限公司 | Battery pack equalization methods, battery management system and battery system |
| CN108780927B (en) * | 2016-02-19 | 2021-06-25 | 宁德时代新能源科技股份有限公司 | Battery pack balancing method, battery management system and battery system |
| CN105826989A (en) * | 2016-06-01 | 2016-08-03 | 深圳市德兰明海科技有限公司 | Intelligently controlled and balanced battery management system |
| CN107797011A (en) * | 2017-12-06 | 2018-03-13 | 深圳市科陆电子科技股份有限公司 | Energy storage BMS balance policy analog detection method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20150318 |
|
| EXPY | Termination of patent right or utility model |